Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Poster – Atomic Clusters
A 20.1: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG
Towards experimental studies of interatomic Coulombic electron capture (ICEC) — •Andre Giraldi1, Deepthy Mootheril1, Nicolas Sisourat2, Thomas Pfeifer1, and Alexander Dorn1 — 1Max Planck Institut für Kernphysik, Heidelberg, Germany — 2Sorbonne Universite, Paris, France
This work targets the experimental detection of an environment assisted atomic decay mechanism, referred to as Interatomic Coulombic Electron Capture, or ICEC. This process consists of a free electron being captured by an atom or molecule, and the excess energy being transferred to a neighbor, ionizing or exciting it. Despite the promising theoretical results [1], there has been so far no experimental detection of ICEC. Aiming to obtain first experimental results, we propose a reaction envolving NeAr dimers:
e + Ne(2p6)Ar --> Ne*-(2p5 3s2)Ar --> Ne-(2p5 3s)Ar+ + e --> NeAr + e + hf
Presently we are adapting an electron and ion momentum spectrometer (reaction microscope) and are optimizing the formation of mixed neon-argon dimers or larger clusters. First results on electron impact ionization will be presented, which confirm the formation of the mixed species and show reactions like Interatomic Coulombic Decay (ICD) taking place.
[1] Jan Šenk, Vincent Graves, Jimena D. Gorfinkiel, Přemysl Kolorenč, Nicolas Sisourat. J. Chem. Phys. 7 November 2024; 161 (17): 174113.
Keywords: ICEC; ICD; clusters; electron impact